package com.tt.reggie.controller;

import com.tt.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

/**
 * 文件的上传下载
 */

@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;

    /**
     * 文件上传
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){

        String originalFilename = file.getOriginalFilename();

        //截取文件名后缀
        String s = originalFilename.substring(originalFilename.lastIndexOf("."));

        //用UUID生成一个文件名，防止文件名称重复
        String newFilename = UUID.randomUUID().toString()+s;

        File dir = new File(basePath);
        //判断文件是否存在，若不在则创建
        if(!dir.exists()){
            dir.mkdirs();
        }
        log.info(file.toString());

        try {
            file.transferTo(new File(basePath + newFilename));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(newFilename);
    }

    /**
     * 文件下载
     * @param name
     * @param response
     */

    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        try {
            //输入流读取文件信息
            FileInputStream fileInputStream = new FileInputStream(new File(basePath+name));

            //输出流将文件写回浏览器
            ServletOutputStream outputStream = response.getOutputStream();

            response.setContentType("image/jpeg");

            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len=fileInputStream.read(bytes))!=-1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }

            //关闭流
            outputStream.close();
            fileInputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}
